Characteristics of Na^+ and K^+ absorption in Suaeda salsa (L.) Pall.(Plant Nutrition)
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概要
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Suaeda salsa can grow well in saline soils with high sodium (Na)-low potassium (K) concentrations. While high Na accumulation in plant tissues plays an important role in osmoregulation and maintenance of water absorption for normal growth of Suaeda salsa, characteristics of Na and K absorption in S. salsa grown in such saline soils have not been elucidated. We thus examined Na and K absorption characteristics of S. salsa grown in nutrient solutions of graded sodium chloride (NaCl) with 1 mmol L^<-1> K or of graded potassium chloride (KCl) with 1 mmol L^<-1> Na. The K accumulation capacity in S. salsa plant tissues was greater than the Na accumulation capacity. Although Na showed no competitive effects on K absorption, K application suppressed Na absorption drastically. Selectivity for K over Na in the absorption system became higher than that for Na over K concomitantly with increased Na or K concentration in the medium, indicating that Suaeda salsa is able to absorb K effectively with absorption of a large amount of Na. Sodium absorption was significantly decreased by tetra-ethylammonium (typical K channel inhibitor). Calcium (Ca) application increased not Na absorption but K absorption, resulting in enhancement of selectivity for K over Na. We speculate Na absorption pathways in S. salsa are partly mediated by AKT1 (Arabidopsis K transporter 1) type K channel and LCT (a low-affinity cation transporter) and NSCCs (non-selective cation channels) are not the major Na absorption pathway. These results may provide an explanation for the fact that S. salsa can grow well under saline soils with high Na-low K concentrations.
著者
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Mori Shinsuke
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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Maeda Yoshiyuki
Department Of Applied Biology And Chemistry Faculty Of Applied Bio-science Tokyo University Of Agric
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Tadano Toshiaki
Tokyo Univ. Agriculture Tokyo Jpn
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Tadano Toshiaki
Hokkaido University
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Higuchi Kyoko
Tokyo Univ. Agriculture Tokyo Jpn
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MAEDA Yoshiyuki
Laboratory of Plant Production Chemistry, Department of Applied Biology and Chemistry, Faculty fo Ap
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Tadano Toshiaki
Laboratory Of Plant Nutrition Faculty Of Agriculture Hokkaido University
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Maeda Yoshiyuki
Tokyo Univ. Agriculture Tokyo Jpn
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MORI Shinsuke
NARO Western Region Agricultural Research Center
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Oda Ryosuke
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Appl
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Yoshiba Masaaki
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Appl
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Higuchi Kyoko
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Appl
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Suzuki Kiyomi
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Appl
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Suzuki Kiyomi
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Applied Bio-science Tokyo University Of Agriculture
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Higuchi Kyoko
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Applied Bio-science Tokyo University Of Agriculture
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Oda Ryosuke
Laboratory Of Plant Production Chemistry Department Of Applied Biology And Chemistry Faculty Of Applied Bio-science Tokyo University Of Agriculture
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